Hydrofluoric and nitric acid in etching baths

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Determination of hydrofluoric and nitric acid in etching baths by potentiometric titration.

a) Determination of the total acid content using the combined Sb electrode and NaOH as titrant.

b) Determination of hydrofluoric acid using the F-ISE and the titrant La(NO3)3.

The concentration of nitric acid is then determined by calculation.